Printing-press.



L. BAKKB.

PRINTING PRESS.

APPLIOATION FILED Nov.1

Patented May 12, 1914 COLUMBIA pLANouR/ull C0 .w^smNOTON. D. c,

LEOPOLD BAKKE, OF CHICAGO, ILLINOIS.

PRINTING-PRESS.

Specification of Letters Patent.

Application filed November 1, 1913.

Patented May 12, 1914. Serial No. 798,630.

To all LU/0m 'it may concern Be it known that I, LEOPOLD BARRE, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Printing-Presses, of which the following is a full, clear, and exact specification.

My invention is concerned with presses of the type in which a rocking platen is associated with a swinging bed-plate, so that during' a portion of the cycle of operation, the platen is presented in proper position to have placed thereon the paper to be printed, and is then swung to printing` position, in which posit-ion the bed-plate is swung to print by the type carried thereby upon the paper carried by the platen. In these presses as heretofore constructed, the

` movement of the platen has been controlled by a cam, which is subject to severe wear, and soon gets the parts out of adjustment.

By my invention, I do away with the cam, substitutinga link connection, and produce a mechanical movement that is simple and durable, and dispense with all the objectional features of the cam mechanism above mentioned.

To illustrate my invention, I annex hereto a sheet of drawings, in which the same ref` erence characters are used to designate identical parts in all the iigures, of which,-

F igure 1 is a side elevation of a press showing the platen in the paper1'eceiving position and the bed-plate retracted, in full lines, with the bed-plate and platen in printing position, in dotted lines; Fig. 2 is a side elevation of the yielding link connection shown in cent-ral longitudinal section; and Fig. 3 is an enlarged detail in section on the line A-A of Fig. 2.

My invention is adapted to be applied to the customary Gordon type of press, in which the frame 10 has the drive shaft 11 mounted therein and rotated by any suitable source of power, this shaft carrying a spurgear pinion 12 meshing with a spur-gear wheel 13 on a shaft 141, also journaled in the frame 10. An eccentric pin 15 on the spur-gear wheel 13 has pivoted thereon a link 16, which is pivotally connected at 17 to the bed-plate frame 18, which is pivcted on the main frame 10 at 19. While the inking mechanism is shown in the drawings,

the invention is not concerned with the operation of said hiking mechanism. The bedplate frame 18 carries the customary typebed 20, and it will be obvious that the rotation of the shaft 14 tends to bring the bed-plate iirst to printing position, and then to retract the same for the inking operation.

Journaled in the frame 10 is a rock shaft 21, which has secured thereon the platen 22, which is swung up into the position shown in full lines in Fig. 1, where it is adapted to have the paper to be printed placed thereon by hand during the time that the bedplate is retracted for .inkingr the type. When an impression is taken, it is obvious that the rock shaft 21 must be rocked to the dottedline position` and the frame 18 similarly swung to its dotted-line position to make the impression, and my present invention is concerned with the connections by which the movement of the bed-plate :frame 18 serves to swing the platen back `and forth at the propel' times and with proper interval between its movements.

In carrying out my invention, I securen the rock shaft 21 an arm 23, and connect this arm with the bed-plate frame by a link, which I will designate generally by the numeral 24. The details of construction of this link are best shown in Figs. 2 and 3, where it will be scen that the inner end is formed preferably of a tube 25, in which` is placed a helically-coiled crpanding` spring 26, which tends to hold the reduced end 27 of the outer portion 2S in the position shown in Figs. 2 and 3, in which position the pin 29, secured in the tube 25, andv passed through a slot is in its outermost position in said slot.` The outer portion 28 is also provided with a helically-coiled expanding spring 31 mounted therein and adaptcdto have its tension increased or diminished by a set screw 32 threaded through a nut secured in the outer end of the portion 28, and cooperating with a plug 34 against which the end of the spring 31 rests. The inner end of the portion 28 preferably takes the shape of an open guide slot 35, in which the block 36 is adapted to reciprocate, said block being preferably provided with into the end of the coil of the spring 31.

The block 36 is held by a pivot piu 38 in its i 30 in said reduced portion 27 a pin 37 extending guide slot 85,

30 shown in Fig. 1, and when 65 it is capable of modifications,

position on the supporting bracket 39 secured to the side of type bed-plate frame 18.

With the construction thus described, the operation of my novel movement is as fol- 5 lows: Assuming that the parts are in the po- 5 plate frame 18 has swung inward far enough so that the block 86 can move to the inner end of the slot 35 under the pressure of the spring 31. This holding the link 211 from movement for this interval, increases the length of time in which the platen 'is held in the feeding position shown in full lines in Fig. l, so that the operator has that much more time to place the paper carefully on the platen. At the end of this movement of the block 36 in the slot 35, the further inward movement of the bed-plate frame 18 moves the' link 241 inward, and as itmoves,

it rocks the shaft 21, bringing itultiinately down to the dotted-line printing position it reaches this position the spring 26 is still expanded, with the pin 29 at the outer end of the slot 80. The taking of the impression necessitates a further inward movement of the bedplate frame, and as the crank arm 23 and the portion 25 of the link cannot move any farther, the outer portion Q8 of the link continues its movement by reason of the reduced end 27 passing farther into the portion 25, compressing the spring 26 as much as be necessary to secure the desired sharpness of the impression. At the end of this `inward movement, the link 16 of course begins to move outward, and this carries the bed-plate frame 18 outward.

When this outward movement starts, the spring 26 expands until the pin 29 rests in the outer endslof the slots 30, after which the link 24: moves as a whole, and the shaft 21 is rocked to swing the platen 22 to the paper-receiving position shown in full lines in F ig. 1. Toward the end of the outward movement of the bed-platek frame 18, the platen 22 is brought to the paper receiving position, in which it cannot be swung any farther, after which the 'continued 'movenient of the bed-plate frame 18 is permitted by reason of the block 86 moving' outward in the slot 85 4and compressing the spring 81, as previously mentioned.

"While 1 have shown and described my invention as embodied in the form which l at present consider best adapted to carry ont its purposes, it will be understood that and that l do plate frame 18 not desire to be limited in the interpretation of the following claims except as may be necessitated by the state of the prior art.

i/Vhat 1 claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from the platen, once for each rotation of the shaft, a crank arm connected to the platen, a yielding link connecting the crank arm and the bed-plate, and means for preventing the movement of the crank arm during the in ward portion of the movement of the bedplate until the latter reaches a certain position.

2. 1n a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plat-e for swinging the latter toward and from the platen, once for each rotation of the shaft, a crank arm connected to the platen, a yielding link connecting the crank arm and the bed-plate, and means for preventing the movement of the crank arm during'the inward portion of the movement of the bedplate until the latter reaches a certain position, said means consisting of a spring that is compressed during the final portion of the outward movement of the bed-plate, and whose expansion during the first portion of its inward movement prevents the movement of the link until the spring has eX- panded.

` 8. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from theV platen, once for each rotation of the shaft, a crank arm connected to the platen, and a yielding link connecting the crank arm and bed-plate, and including two springs, one of which is compressed during the final portion of the outward movement of the bed-plate, and whose eXpansion during' the iirst portion of the inward movement prevents the movement 'of the link until said spring has expanded, and the other one of which is compressed effectually t'o shorten the link at the time the impression is actually taken.

4. 1n a press, the combination with a frame, of a driving shaft iournaled therein, a swinging bed-'plate pivoted on the frame, a platen pivoted on the frame, connections between the `shaft and the bed-plate for swinging the latter toward and from the einen, once for each rotation or nie shaft,

a crank arm connected to the platen, a twopart link connecting the crank arm and the bed-plate and having telescoping connections, and a spring in said link tending to keep it extended.

5. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plane for swinging the latter' toward and from the platen, once for each rotation of lthe shaft, a crank arm connected to the platen, a two-part link connecting the crank arm and the hed-plate and having telescoping connections, a spring in said link tending to keep it extended, and a second spring carried by the link and compressed by the connection of the bedplate With the link at the end of the out- Ward movement of the bed-plate to increase the effective length of the link.

6. In a press, the combination With a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame,

Copies of this patent may be obtained for a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from the platen, once for each rotation of the shat, a crank arm connected to the platen, a link connecting the crank arln and the bed-plate, and comprising a tubular inner portion having a helically-coiled expanding spring therein, and an outer portion having its inner end telescoping in the outer end of the inner portion, and having a recess therein adjacent its inner end, a helically-coiled expanding spring in said outer portion beyond the recess, and a block sliding in the recess in said outer portion, said block being pivotally carried by the hed-plate.

In Witness whereof, I have hereunto set my hand and a'lxed my seal, this 16th day of October, A. D. 1913.

LEOPOLD BAKKE.

Witnesses JOHN HOWARD MGELROY, MILDRED ELSNER.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

